My view from reading reviews is the Phenom II 940 is a bit ahead of the Core II Q9400 and the 920 just behind the Q9400. Both of the Phenom IIs are priced attractively at below the £200 mark. The AM3 versions due out next month should give another modest performance boost.
Core i7 depends on what you are using it for. Check out some reviews but I personally wouldn't bother with it if you are primarily using it for gaming.
Core i7 depends on what you are using it for. Check out some reviews but I personally wouldn't bother with it if you are primarily using it for gaming.